Shower curtain



FIG. 1 is a front perspective view of a shower curtain in accordance with the design, shown in a position of use with a tub;

FIG. 2 is a rear perspective view thereof, shown in a position of use with a tub;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a left elevational view thereof;

FIG. 6 is a right elevational view thereof; and,

FIG. 7 is a rear perspective view thereof, shown in a position of use with a tub.

Dot-dashed broken lines depict environmental subject matter which form no part of the claimed design. 

CLAIM The ornamental design for a shower curtain, as shown and described. 